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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9779b0bc2a3f775cdb754667de61b78d5778b4e93ee96feeb260ae56395cee' 
  AND token = 'UwgEyC7zDu19IiDUh+9qDdS2xDmB3petaVv/enocU9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}